When I was still working in a new building of the Rheinau Psychiatric Center, my knee and foot joints would ache on the concrete floors within a very short time. Then I changed jobs and worked in the cowshed of the Fintan Foundation, which was built around the same time. I noticed that I also spent a long time walking on concrete floors here, but without any discomfort. Every now and then, I would walk barefoot on the concrete, which somehow felt soft to me or at least not really hard. After a while, I asked one of my colleagues why this concrete seemed softer and if anything had been done to it. He then told me about Pneumatit®, a product that I had never heard of before.